A Shape-Memory and Durable Transparent Polyacrylate Film Integrated by Soft-Rigid Chains

Area of Science:

• Materials Science
• Polymer Chemistry
• Optoelectronics

Background:

• Flexible displays require multifunctional films with properties like stretchability, transparency, and shape memory.
• Existing materials often struggle to balance these diverse requirements for advanced applications.

Purpose of the Study:

• To design and synthesize a flexible polyacrylate (PA) film with high transparency, shape memory, and superior abrasion resistance.
• To evaluate the mechanical, optical, and shape memory properties of the developed PA film.

Main Methods:

• Free radical polymerization of acrylate monomers using a vinyl-terminated polyurethane prepolymer as a cross-linker under UV light.
• Incorporation of acrylate monomers with functional groups (epoxy, benzene rings) to tailor soft-rigid chains and hydrogen bonding.

Main Results:

• The PA films maintained over 91% transparency after 500 folding cycles and 1000 abrasion cycles.
• The films exhibited excellent shape memory, fixing folded shapes at low temperatures and recovering the original shape at room temperature.
• Demonstrated successful application on a curved touchscreen, highlighting potential as a flexible substrate.

Conclusions:

• The developed polyacrylate film offers a promising solution for flexible display substrates due to its integrated properties.
• The material's durability and shape-memory effect are crucial for next-generation foldable and stretchable electronic devices.
• This research signifies a step forward in creating robust and versatile materials for the evolving field of flexible electronics.